So much fun. At first she didn't quite know how to take it, growling, pushing at it. Now I'm purposefully trying to see how durable it is, allowing my 35 lb. Australian Sheepdog/Border Collie mix, chew at her hearts content. She has figured out that I control it too, and as smart as she is, which is very smart, she will bring it to me and then nudge my phone as if to say, "c'mon dad, move it for me!" Beyond the teeth marks which are unavoidable and don't affect it's functionality,! this thing is by far and away the best toy to keep our pets entertained for hours on end. With an awesome run time and zero maintenance it's worth every penny.